If nobody in the world was manufacturing any weapons and it was fully observable from space, nobody would have cause to manufacture these kinds of weapons. We do not live in that world.
At some point, any reasonable person should agree that if a country exists in an environment that contains many threats it might need to defend itself or others from, then it makes complete sense for it to develop weapons towards that aim. Countries are not people, people are people. So people make the weapons.
It just so happens that Palmer Luckey is a person. He can't sell weapons to any random person or country he wants, he can only sell them to the US or with permission of the US to a country that the US has a strategic interest in defending.
Precision weapons have helped reduce casualties. This is a fact. Please try to contradict this fact in the face of napalm bombing and nuclear bombs of yesteryears. Please try to tell me that precision weapons aren't better than just randomly aiming artillery at the sky and letting'er rip. Please do. I want to hear your well founded argument for this.
Is it more efficient than napalm? Great. It still will be used to kill people which I find to be gross, especially when innocents will die, too. If somebody has to build weapons and somebody has to fund said weapons maker, I'm glad it doesn't have to be me. Doesn't have to be Palmer either.
If they should be killed, then they should be killed with the minimum number of civilian casualties possible.
Countless millions of people died in World War 1 and World War 2. So many people died that we only have estimates, because there were too many to count individually.
If nobody pushed back against Japan, Germany, Russia, North Korea, China, Iraq, Iran and so on, the world would not be a better place. It would be a place where full on global war was legitimized as a viable global domination strategy. And global domination was in fact the goal back then. The problem is, we aren't sure that goal has ever gone away.
As a result, the entire world is a chess board with smaller countries being manipulated or compromised in various ways for some other grand strategy. For many years now we've accepted that there would largely be some sort of equilibrium or status quo. Except these smaller countries also have a mind of their own and their people universally reject being controlled and manipulated.
Russia with Ukraine. China with Taiwan. North Korea with South Korea. Venezuela with Guyana. Iran with Israel, Iraq, Yemen, etc. Now suddenly all of these countries are all the prowl almost simultaneously. If you only look at US action, look at the world we're reacting to. It's not as simple as some political propagandist hitjob soundbite on TV being the complete answer.